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The idea is to fire a bunch of neutrons at the soil and watch for radiation indicative of Nitrogen. Neutron Moderation is the only viably portably technique, but this technique will also detect hydrogen in soil moisture.

Limitations:

Requires low soil moisture

Requires several seconds to acquire an image and is thus more useful for confirmation than primary detection.

Low power neutron sources are currently under development by the Canadian department of defense. Most useful for confirmation of detection by other methods.